Improvement in machine for grinding the cutters of mowing-machined



H. DODGE.

Harvester-Cuttqr Grinder.

No. 92,431. Patented July is, 1869.

W WW

HENRY DODGE, OF WASHINGTON MILLS, NEW YORK.

Letters Patent No. 92,431, dctedJuly 13, 1869.

IMPROVEMENT IN MACHINE FOR GRINDING THE CUTTERS OF MOWING-MACHINIEfi.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, HENRY DODGE, of Washington Mills, in the county of Oneida, and State of New York, have invented a new and useful Improvement in Harvester-Knife Grinder; and I do hereby declare that'- the following is a fnll,-clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being bad to the accompanying drawings, forming part 'of this specification, in which- Figure l is a plan view'of my improvement, and

Figure 2 is a side view-of the saiiiel Figures 3 and 4 are detail views.

Similar. letters of reference indicate like parts in all the figures.

This invention relzges to certain improvements in harvester-knife grinders, whereby a greater degree of adjustability, and a more efiieient operation of the parts is obtained, as hereinafter more fully explained.

Inthe accompanying drawings A is an ordinary grindstone, and

B, its frame.

' Upon the frame B is secured a semicircular plate, C, having a curved slot, 0, fig. 4.

Upon this plate is placed abase, D, slotted longitudinally, as shown by slot (Z d, fig. 1.

The base D is held upon the semicircular base 0, is an adjustable manner, bya screw and hand-wheel, e.

The base D is provided with uprights H H, which support the knife-holder F, by means of hinges or pivots, h 71, so that the said knife-holder can be thrown forward or back, to carry the knife or sickle to and from the stone.

The uprights H Hare each attached to the base D by a pivot, i, fig. 2, and each upright, or standard H, has also a curved slot, is, which is occupied by a setscrew,l, so that, by slackening the set-screw I, the standards H can be set more forward or back, to adjust the hinges, or centres of motion h h, to a proper distance from the stone.

The uprights or standards also have shoulders on their upper ends, for the bar F, or knife-holder, to lie upon, when thrown back for changing the sickle on the stone.

Fig. 3 is a horizontal section of the sickle-holding moved.

' side, on which are placed spiral'springs o o, to throw the jaws out so that the sickle is more free to be Said projections o 0 may be made to pass throng],

holes in the bar F, and merely act as steadying-guidesfor the jaws 111, while the spring may be obtained by placing a single coiled spring around the screw n, in the centre, and thesprings at 0 o be dispensed with.

The crankis changed over to the opposite end of the shaft a, when the angle of the sickle is reversed.

By tliese means the sickle-holding bar F is readily adjusted to any desired position, with the greatest facility, and the edges of the knives are applied to the stone in a line more nearlyacross its face than ordinarily, so that the knives are less liable to be ground with a hollow edge; and, by means of the lower base, or slotted semicircle G, the holder F can take up a position, by which the knives that are fastened on .near the eye of the sickle can be ground as readily as the others, and works equally well with right or lefthand sicklcs.

Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, is

1. The slotted semicircular base (3 c, as and for the purpose herein described.

2. The double-jawed clamp m m, worked by a single screw at the centre, and having releasing-springs 0, as and for the purpose hereindescribed.

3. The hinged sickle-holder F m 1:, adjustable standards H H, transversely-adjustable base D d c, and semicircular base 0 c, all constructed and arranged as and for the purpose described. I

The above specification of my invention signed by me, this3lst day of March, 1869.

HENRY DODGE.

Witnesses:

WM. .1. DODGE, F. A. MORLEY. 

